Slope, Albedo, Magnitude values help SpaceEngine better simulate the object. Epoch value is the time of orbital elements you find for an object, expressed in Julian Days. When it's not in that form, we can use a converter.

Thanks! I kept making the mistake of expressing epoch in seconds and was wondering why my numbers seemed to large.I assume slope, albedo, and magnitude are used to calculate an object's brightness, what is the difference between them?

Just one question. Will all those asteroids and objects be in 0.981? Or they will remain as addons? They probably will be added, but I was wondering if some user made things would be added in the game.

Source of the post I assume slope, albedo, and magnitude are used to calculate an object's brightness, what is the difference between them?

Sorry, didn't see this. As far as I know, Slope is a parameter indicating the curvature of the object, hence the shape. Albedo is a measure of the reflectivity of the surface, which helps figuring the composition, and possible dimension given the magnitude.